#include <iostream>
#include <string>

using namespace std;

int main(int argc, char *argv[], char *env[])
{
  for (int i = 0;  i< argc; i++){
    cout << "argv["<< i << "]"<<": "<< argv[i] << endl;
  }

  string s = argv[1];

  if(s == "-a"){
    cout << "hello a" << endl;
  }
  else{
    cout << "hello b" << endl;
  }
  

  return 0;
}
